The Solar Thermal System Does Not Start; The Display Illumination Flashes - Viessmann VITOSOLIC 200 Operating Instructions Manual

What to do if...

The solar thermal system does not start

Cause
The ON/OFF switch is switched off.
The solar control unit MCB has responded (mains volt-
age is present, display is not illuminated).
Collector limit temperature or set cylinder temperature
has been reached.
The solar control unit is in "Manual mode".
There is no DHW available
Cause
The solar control unit is faulty.
Collector temperature is too high; safety shutdown by
the solar control unit.
The set cylinder temperature (set DHW temperature)
has been set too low.
The solar circuit pump is faulty.
The DHW cylinder is not being reheated:
The operating and time program is incorrectly set at the
boiler control unit.
The display is dark
Cause
Power failure
The power distribution MCB (main domestic MCB) has
responded (no mains voltage is present).

The display illumination flashes

Cause
Solar thermal system fault.
8
Remedy
Switch the ON/OFF switch ON.
Inform your local heating contractor.
Wait until the relevant temperature has fallen below its
respective limit.
Select "Auto" as follows:
1. Press .
2. Press until "Manual mode" is displayed.
3. Press OK to confirm.
4. Press until "Relay 1" etc. is displayed.
5. Press OK to confirm.
6. Press the / keys for "Auto".
7. Press OK to confirm.
8. Press until "Main menu" is displayed.
Remedy
Inform your local heating contractor.
Wait until the collector temperature has dropped.
Inform your local heating contractor.
Inform your local heating contractor.
Enable DHW heating.
Operating instructions of the boiler control unit
Remedy
The solar control unit automatically returns to operation
once the power supply has been restored.
Check the MCB and inform your heating contractor if
necessary.
Remedy
Call up the fault (see following chapter) and contact
your local heating contractor if necessary.